63 lines
2.1 KiB
JavaScript
63 lines
2.1 KiB
JavaScript
import { Transform } from "node:stream";
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import iconv from "iconv-lite";
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import { Sniffer, getEncoding } from "./sniffer.js";
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/**
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* Sniff the encoding of a buffer, then decode it.
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*
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* @param buffer Buffer to be decoded
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* @param options Options for the sniffer
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* @returns The decoded buffer
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*/
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export function decodeBuffer(buffer, options = {}) {
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return iconv.decode(buffer, getEncoding(buffer, options));
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}
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/**
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* Decodes a stream of buffers into a stream of strings.
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*
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* Reads the first 1024 bytes and passes them to the sniffer. Once an encoding
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* has been determined, it passes all data to iconv-lite's stream and outputs
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* the results.
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*/
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export class DecodeStream extends Transform {
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constructor(options) {
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var _a;
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super({ decodeStrings: false, encoding: "utf-8" });
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this.buffers = [];
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/** The iconv decode stream. If it is set, we have read more than `options.maxBytes` bytes. */
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this.iconv = null;
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this.readBytes = 0;
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this.sniffer = new Sniffer(options);
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this.maxBytes = (_a = options === null || options === void 0 ? void 0 : options.maxBytes) !== null && _a !== void 0 ? _a : 1024;
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}
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_transform(chunk, _encoding, callback) {
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if (this.readBytes < this.maxBytes) {
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this.sniffer.write(chunk);
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this.readBytes += chunk.length;
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if (this.readBytes < this.maxBytes) {
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this.buffers.push(chunk);
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callback();
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return;
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}
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}
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this.getIconvStream().write(chunk, callback);
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}
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getIconvStream() {
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if (this.iconv) {
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return this.iconv;
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}
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const stream = iconv.decodeStream(this.sniffer.encoding);
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stream.on("data", (chunk) => this.push(chunk, "utf-8"));
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stream.on("end", () => this.push(null));
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this.iconv = stream;
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for (const buffer of this.buffers) {
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stream.write(buffer);
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}
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this.buffers.length = 0;
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return stream;
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}
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_flush(callback) {
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this.getIconvStream().end(callback);
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}
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}
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export { getEncoding } from "./sniffer.js";
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//# sourceMappingURL=index.js.map
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